<?php
/*
 * jQuery File Upload Plugin PHP Class 6.4.2
* https://github.com/blueimp/jQuery-File-Upload
*
* Copyright 2010, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/MIT
*/

class QUploadHandler
{
	protected $options;
	public $result="";
	// PHP File Upload error message codes:
	// http://php.net/manual/en/features.file-upload.errors.php
	protected $error_messages = array(
			1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini',
			2 => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
			3 => 'The uploaded file was only partially uploaded',
			4 => 'No file was uploaded',
			6 => 'Missing a temporary folder',
			7 => 'Failed to write file to disk',
			8 => 'A PHP extension stopped the file upload',
			'post_max_size' => 'The uploaded file exceeds the post_max_size directive in php.ini',
			'max_file_size' => 'File is too big',
			'min_file_size' => 'File is too small',
			'accept_file_types' => 'Filetype not allowed',
			'max_number_of_files' => 'Maximum number of files exceeded',
			'max_width' => 'Image exceeds maximum width',
			'min_width' => 'Image requires a minimum width',
			'max_height' => 'Image exceeds maximum height',
			'min_height' => 'Image requires a minimum height'
					);

	function __construct($options = null, $initialize = true, $error_messages = null) {
		$this->options = array(
				'script_url' => $this->get_full_url().'/',
				'upload_dir' => dirname($this->get_server_var('SCRIPT_FILENAME')).'/files/',
				'upload_url' => $this->get_full_url().'/files/',
				'user_dirs' => false,
				'mkdir_mode' => 0755,
				'param_name' => 'files',
				// Set the following option to 'POST', if your server does not support
				// DELETE requests. This is a parameter sent to the client:
				'delete_type' => 'DELETE',
				'access_control_allow_origin' => '*',
				'access_control_allow_credentials' => false,
				'access_control_allow_methods' => array(
						'OPTIONS',
						'HEAD',
						'GET',
						'POST',
						'PUT',
						'PATCH',
						'DELETE'
				),
				'access_control_allow_headers' => array(
						'Content-Type',
						'Content-Range',
						'Content-Disposition'
				),
				// Enable to provide file downloads via GET requests to the PHP script:
				'download_via_php' => false,
				// Defines which files can be displayed inline when downloaded:
				'inline_file_types' => '/\.(gif|jpe?g|png)$/i',
				// Defines which files (based on their names) are accepted for upload:
				'accept_file_types' => '/.+$/i',
				// The php.ini settings upload_max_filesize and post_max_size
				// take precedence over the following max_file_size setting:
				'max_file_size' => null,
				'min_file_size' => 1,
				// The maximum number of files for the upload directory:
				'max_number_of_files' => null,
				// Image resolution restrictions:
				'max_width' => null,
				'max_height' => null,
				'min_width' => 1,
				'min_height' => 1,
				// Set the following option to false to enable resumable uploads:
				'discard_aborted_uploads' => true,
				// Set to true to rotate images based on EXIF meta data, if available:
				'orient_image' => false,
				'image_versions' => array(
						// Uncomment the following version to restrict the size of
						// uploaded images:
						/*
						 '' => array(
						 		'max_width' => 1920,
						 		'max_height' => 1200,
						 		'jpeg_quality' => 95
						 ),
		*/
						// Uncomment the following to create medium sized images:
						/*
		'medium' => array(
				'max_width' => 800,
				'max_height' => 600,
				'jpeg_quality' => 80
		),
		*/
						'thumbnail' => array(
								// Uncomment the following to force the max
								// dimensions and e.g. create square thumbnails:
								//'crop' => true,
								'max_width' => 170,
								'max_height' => 140
						)
				)
		);
		if ($options) {
			$this->options = array_merge($this->options, $options);
		}
		if ($error_messages) {
			$this->error_messages = array_merge($this->error_messages, $error_messages);
		}
		if ($initialize) {
			$this->initialize();
		}
	}

	protected function initialize() {
		switch ($this->get_server_var('REQUEST_METHOD')) {
			case 'OPTIONS':
			case 'HEAD':
				$this->head();
				break;
			case 'GET':
				$this->get();
				break;
			case 'PATCH':
			case 'PUT':
			case 'POST':
				$result=$this->post();
				$this->result=$result;
				break;
			case 'DELETE':
				$this->delete();
				break;
			default:
				$this->header('HTTP/1.1 405 Method Not Allowed');
		}
	}

	protected function get_full_url() {
		$https = !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off';
		return
		($https ? 'https://' : 'http://').
		(!empty($_SERVER['REMOTE_USER']) ? $_SERVER['REMOTE_USER'].'@' : '').
		(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : ($_SERVER['SERVER_NAME'].
				($https && $_SERVER['SERVER_PORT'] === 443 ||
						$_SERVER['SERVER_PORT'] === 80 ? '' : ':'.$_SERVER['SERVER_PORT']))).
						substr($_SERVER['SCRIPT_NAME'],0, strrpos($_SERVER['SCRIPT_NAME'], '/'));
	}

	protected function get_user_id() {
		@session_start();
		return session_id();
	}

	protected function get_user_path() {
		if ($this->options['user_dirs']) {
			return $this->get_user_id().'/';
		}
		return '';
	}

	protected function get_upload_path($file_name = null, $version = null) {
		$file_name = $file_name ? $file_name : '';
		$version_path = empty($version) ? '' : $version.'/';
		return $this->options['upload_dir'].$this->get_user_path()
		.$version_path.$file_name;
		

	}

	protected function get_query_separator($url) {
		return strpos($url, '?') === false ? '?' : '&';
	}

	protected function get_download_url($file_name, $version = null) {
		if ($this->options['download_via_php']) {
			$url = $this->options['script_url']
			.$this->get_query_separator($this->options['script_url'])
			.'file='.rawurlencode($file_name);
			if ($version) {
				$url .= '&version='.rawurlencode($version);
			}
			return $url.'&download=1';
		}
		$version_path = empty($version) ? '' : rawurlencode($version).'/';
		return $this->options['upload_url'].$this->get_user_path()
		.$version_path.rawurlencode($file_name);
	}

	protected function set_file_delete_properties($file) {
		$file->delete_url = $this->options['script_url']
		.$this->get_query_separator($this->options['script_url'])
		.'file='.rawurlencode($file->name);
		$file->delete_type = $this->options['delete_type'];
		if ($file->delete_type !== 'DELETE') {
			$file->delete_url .= '&_method=DELETE';
		}
		if ($this->options['access_control_allow_credentials']) {
			$file->delete_with_credentials = true;
		}
	}

	// Fix for overflowing signed 32 bit integers,
	// works for sizes up to 2^32-1 bytes (4 GiB - 1):
	protected function fix_integer_overflow($size) {
		if ($size < 0) {
			$size += 2.0 * (PHP_INT_MAX + 1);
		}
		return $size;
	}

	protected function get_file_size($file_path, $clear_stat_cache = false) {
		if ($clear_stat_cache) {
			clearstatcache(true, $file_path);
		}
		return $this->fix_integer_overflow(filesize($file_path));

	}

	protected function is_valid_file_object($file_name) {
		$file_path = $this->get_upload_path($file_name);
		if (is_file($file_path) && $file_name[0] !== '.') {
			return true;
		}
		return false;
	}

	protected function get_file_object($file_name) {
		if ($this->is_valid_file_object($file_name)) {
			$file = new stdClass();
			$file->name = $file_name;
			$file->size = $this->get_file_size(
					$this->get_upload_path($file_name)
			);
			$file->url = $this->get_download_url($file->name);
			foreach($this->options['image_versions'] as $version => $options) {
				if (!empty($version)) {
					if (is_file($this->get_upload_path($file_name, $version))) {
						$file->{$version.'_url'} = $this->get_download_url(
								$file->name,
								$version
						);
					}
				}
			}
			$this->set_file_delete_properties($file);
			return $file;
		}
		return null;
	}

	protected function get_file_objects($iteration_method = 'get_file_object') {
		$upload_dir = $this->get_upload_path();
		if (!is_dir($upload_dir)) {
			return array();
		}
		return array_values(array_filter(array_map(
				array($this, $iteration_method),
				scandir($upload_dir)
		)));
	}

	protected function count_file_objects() {
		return count($this->get_file_objects('is_valid_file_object'));
	}

	protected function create_scaled_image($file_name, $version, $options) {
		$file_path = $this->get_upload_path($file_name);
		if (!empty($version)) {
			$version_dir = $this->get_upload_path(null, $version);
			if (!is_dir($version_dir)) {
				mkdir($version_dir, $this->options['mkdir_mode'], true);
			}
			$new_file_path = $version_dir.'/'.$file_name;
		} else {
			$new_file_path = $file_path;
		}
		if (!function_exists('getimagesize')) {
			error_log('Function not found: getimagesize');
			return false;
		}
		list($img_width, $img_height) = @getimagesize($file_path);
		if (!$img_width || !$img_height) {
			return false;
		}
		$max_width = $options['max_width'];
		$max_height = $options['max_height'];
		$scale = min(
				$max_width / $img_width,
				$max_height / $img_height
		);
		if ($scale >= 1) {
			if ($file_path !== $new_file_path) {
				return copy($file_path, $new_file_path);
			}
			return true;
		}
		if (!function_exists('imagecreatetruecolor')) {
			error_log('Function not found: imagecreatetruecolor');
			return false;
		}
		if (empty($options['crop'])) {
			$new_width = $img_width * $scale;
			$new_height = $img_height * $scale;
			$dst_x = 0;
			$dst_y = 0;
			$new_img = @imagecreatetruecolor($new_width, $new_height);
		} else {
			if (($img_width / $img_height) >= ($max_width / $max_height)) {
				$new_width = $img_width / ($img_height / $max_height);
				$new_height = $max_height;
			} else {
				$new_width = $max_width;
				$new_height = $img_height / ($img_width / $max_width);
			}
			$dst_x = 0 - ($new_width - $max_width) / 2;
			$dst_y = 0 - ($new_height - $max_height) / 2;
			$new_img = @imagecreatetruecolor($max_width, $max_height);
		}
		switch (strtolower(substr(strrchr($file_name, '.'), 1))) {
			case 'jpg':
			case 'jpeg':
				$src_img = @imagecreatefromjpeg($file_path);
				$write_image = 'imagejpeg';
				$image_quality = isset($options['jpeg_quality']) ?
				$options['jpeg_quality'] : 75;
				break;
			case 'gif':
				@imagecolortransparent($new_img, @imagecolorallocate($new_img, 0, 0, 0));
				$src_img = @imagecreatefromgif($file_path);
				$write_image = 'imagegif';
				$image_quality = null;
				break;
			case 'png':
				@imagecolortransparent($new_img, @imagecolorallocate($new_img, 0, 0, 0));
				@imagealphablending($new_img, false);
				@imagesavealpha($new_img, true);
				$src_img = @imagecreatefrompng($file_path);
				$write_image = 'imagepng';
				$image_quality = isset($options['png_quality']) ?
				$options['png_quality'] : 9;
				break;
			default:
				$src_img = null;
		}
		$success = $src_img && @imagecopyresampled(
				$new_img,
				$src_img,
				$dst_x,
				$dst_y,
				0,
				0,
				$new_width,
				$new_height,
				$img_width,
				$img_height
		) && $write_image($new_img, $new_file_path, $image_quality);
		// Free up memory (imagedestroy does not delete files):
		@imagedestroy($src_img);
		@imagedestroy($new_img);
		return $success;
	}

	protected function get_error_message($error) {
		return array_key_exists($error, $this->error_messages) ?
		$this->error_messages[$error] : $error;
	}

	function get_config_bytes($val) {
		$val = trim($val);
		$last = strtolower($val[strlen($val)-1]);
		switch($last) {
			case 'g':
				$val *= 1024;
			case 'm':
				$val *= 1024;
			case 'k':
				$val *= 1024;
		}
		return $this->fix_integer_overflow($val);
	}

	protected function validate($uploaded_file, $file, $error, $index) {
		if ($error) {
			$file->error = $this->get_error_message($error);
			return false;
		}
		$content_length = $this->fix_integer_overflow(intval(
				$this->get_server_var('CONTENT_LENGTH')
		));
		$post_max_size = $this->get_config_bytes(ini_get('post_max_size'));
		if ($post_max_size && ($content_length > $post_max_size)) {
			$file->error = $this->get_error_message('post_max_size');
			return false;
		}
		if (!preg_match($this->options['accept_file_types'], $file->name)) {
			$file->error = $this->get_error_message('accept_file_types');
			return false;
		}
		if ($uploaded_file && is_uploaded_file($uploaded_file)) {
			$file_size = $this->get_file_size($uploaded_file);
		} else {
			$file_size = $content_length;
		}
		$file_size = $content_length;

		if ($this->options['max_file_size'] && (
				$file_size > $this->options['max_file_size'] ||
				$file->size > $this->options['max_file_size'])
		) {
			$file->error = $this->get_error_message('max_file_size');
			return false;
		}
		if ($this->options['min_file_size'] &&
				$file_size < $this->options['min_file_size']) {
			$file->error = $this->get_error_message('min_file_size');

			return false;
		}
		if (is_int($this->options['max_number_of_files']) && (
				$this->count_file_objects() >= $this->options['max_number_of_files'])
		) {
			$file->error = $this->get_error_message('max_number_of_files');
			return false;
		}
		list($img_width, $img_height) = @getimagesize($uploaded_file);
		if (is_int($img_width)) {
			if ($this->options['max_width'] && $img_width > $this->options['max_width']) {
				$file->error = $this->get_error_message('max_width');
				return false;
			}
			if ($this->options['max_height'] && $img_height > $this->options['max_height']) {
				$file->error = $this->get_error_message('max_height');
				return false;
			}
			if ($this->options['min_width'] && $img_width < $this->options['min_width']) {
				$file->error = $this->get_error_message('min_width');
				return false;
			}
			if ($this->options['min_height'] && $img_height < $this->options['min_height']) {
				$file->error = $this->get_error_message('min_height');
				return false;
			}
		}
		return true;
	}

	protected function upcount_name_callback($matches) {
		$index = isset($matches[1]) ? intval($matches[1]) + 1 : 1;
		$ext = isset($matches[2]) ? $matches[2] : '';
		return ' ('.$index.')'.$ext;
	}

	protected function upcount_name($name) {
		return preg_replace_callback(
				'/(?:(?: \(([\d]+)\))?(\.[^.]+))?$/',
				array($this, 'upcount_name_callback'),
				$name,
				1
		);
	}

	protected function get_unique_filename($name, $type, $index, $content_range) {
		while(is_dir($this->get_upload_path($name))) {
			$name = $this->upcount_name($name);
		}
		// Keep an existing filename if this is part of a chunked upload:
		$uploaded_bytes = $this->fix_integer_overflow(intval($content_range[1]));
		while(is_file($this->get_upload_path($name))) {
			if ($uploaded_bytes === $this->get_file_size(
					$this->get_upload_path($name))) {
				break;
			}
			$name = $this->upcount_name($name);
		}
		return $name;
	}

	protected function trim_file_name($name, $type, $index, $content_range) {
		// Remove path information and dots around the filename, to prevent uploading
		// into different directories or replacing hidden system files.
		// Also remove control characters and spaces (\x00..\x20) around the filename:
		$name = trim(basename(stripslashes($name)), ".\x00..\x20");
		// Use a timestamp for empty filenames:
		if (!$name) {
			$name = str_replace('.', '-', microtime(true));
		}
		// Add missing file extension for known image types:
		if (strpos($name, '.') === false &&
				preg_match('/^image\/(gif|jpe?g|png)/', $type, $matches)) {
			$name .= '.'.$matches[1];
		}
		return $name;
	}

	protected function get_file_name($name, $type, $index, $content_range) {
		return $this->get_unique_filename(
				$this->trim_file_name($name, $type, $index, $content_range),
				$type,
				$index,
				$content_range
		);
	}

	protected function handle_form_data($file, $index) {
		// Handle form data, e.g. $_REQUEST['description'][$index]
	}

	protected function orient_image($file_path) {
		if (!function_exists('exif_read_data')) {
			return false;
		}
		$exif = @exif_read_data($file_path);
		if ($exif === false) {
			return false;
		}
		$orientation = intval(@$exif['Orientation']);
		if (!in_array($orientation, array(3, 6, 8))) {
			return false;
		}
		$image = @imagecreatefromjpeg($file_path);
		switch ($orientation) {
			case 3:
				$image = @imagerotate($image, 180, 0);
				break;
			case 6:
				$image = @imagerotate($image, 270, 0);
				break;
			case 8:
				$image = @imagerotate($image, 90, 0);
				break;
			default:
				return false;
		}
		$success = imagejpeg($image, $file_path);
		// Free up memory (imagedestroy does not delete files):
		@imagedestroy($image);
		return $success;
	}

	protected function handle_image_file($file_path, $file) {
		if ($this->options['orient_image']) {
			$this->orient_image($file_path);
		}
		$failed_versions = array();
		foreach($this->options['image_versions'] as $version => $options) {
			if ($this->create_scaled_image($file->name, $version, $options)) {
				if (!empty($version)) {
					$file->{$version.'_url'} = $this->get_download_url(
							$file->name,
							$version
					);
				} else {
					$file->size = $this->get_file_size($file_path, true);
				}
			} else {
				$failed_versions[] = $version;
			}
		}
		switch (count($failed_versions)) {
			case 0:
				break;
			case 1:
				$file->error = 'Failed to create scaled version: '
						.$failed_versions[0];
						break;
			default:
				$file->error = 'Failed to create scaled versions: '
						.implode($failed_versions,', ');
		}
	}

	protected function handle_file_upload($uploaded_file, $name, $size, $type, $error,
			$index = null, $content_range = null) {
		$file = new stdClass();
		$file->name = $this->get_file_name($name, $type, $index, $content_range);
		

		
		$file->size = $this->fix_integer_overflow(intval($size));
		$file->type = $type;
		if ($this->validate($uploaded_file, $file, $error, $index)) {
			$this->handle_form_data($file, $index);
			$upload_dir = $this->get_upload_path();
			if (!is_dir($upload_dir)) {
				mkdir($upload_dir, $this->options['mkdir_mode'], true);
			}
			
			
			$ext = end(explode('.',$file->name));
			$file->name=time().'.'.$ext;
			$file_path = $this->get_upload_path($file->name);

			$append_file = $content_range && is_file($file_path) &&
			$file->size > $this->get_file_size($file_path);
			if ($uploaded_file && is_uploaded_file($uploaded_file)) {
				// multipart/formdata uploads (POST method uploads)
				if ($append_file) {
					file_put_contents(
					$file_path,
					fopen($uploaded_file, 'r'),
					FILE_APPEND
					);
				} else {
					move_uploaded_file($uploaded_file, $file_path);
				}
			} else {
				// Non-multipart uploads (PUT method support)
				file_put_contents(
				$file_path,
				fopen('php://input', 'r'),
				$append_file ? FILE_APPEND : 0
				);
			}
			$file_size = $this->get_file_size($file_path, $append_file);
			if ($file_size === $file->size) {
				$file->url = $this->get_download_url($file->name);
				list($img_width, $img_height) = @getimagesize($file_path);
				if (is_int($img_width)) {
					$this->handle_image_file($file_path, $file);
				}
			} else {
				$file->size = $file_size;
				if (!$content_range && $this->options['discard_aborted_uploads']) {
					unlink($file_path);
					$file->error = 'abort';
				}
			}
			$this->set_file_delete_properties($file);
		}
		return $file;
	}

	protected function readfile($file_path) {
		return readfile($file_path);
	}

	protected function body($str) {
		echo $str;
	}

	protected function header($str) {
		header($str);
	}

	protected function get_server_var($id) {
		return isset($_SERVER[$id]) ? $_SERVER[$id] : '';
	}

	protected function generate_response($content, $print_response = true) {
		if ($print_response) {
			$json = json_encode($content);
			$redirect = isset($_REQUEST['redirect']) ?
			stripslashes($_REQUEST['redirect']) : null;
			if ($redirect) {
				$this->header('Location: '.sprintf($redirect, rawurlencode($json)));
				return;
			}
			$this->head();
			if ($this->get_server_var('HTTP_CONTENT_RANGE')) {
				$files = isset($content[$this->options['param_name']]) ?
				$content[$this->options['param_name']] : null;
				if ($files && is_array($files) && is_object($files[0]) && $files[0]->size) {
					$this->header('Range: 0-'.(
							$this->fix_integer_overflow(intval($files[0]->size)) - 1
					));
				}
			}
			$this->body($json);
		}
		return $content;
	}

	protected function get_version_param() {
		return isset($_GET['version']) ? basename(stripslashes($_GET['version'])) : null;
	}

	protected function get_file_name_param() {
		return isset($_GET['file']) ? basename(stripslashes($_GET['file'])) : null;
	}

	protected function get_file_type($file_path) {
		switch (strtolower(pathinfo($file_path, PATHINFO_EXTENSION))) {
			case 'jpeg':
			case 'jpg':
				return 'image/jpeg';
			case 'png':
				return 'image/png';
			case 'gif':
				return 'image/gif';
			default:
				return '';
		}
	}

	protected function download() {
		if (!$this->options['download_via_php']) {
			$this->header('HTTP/1.1 403 Forbidden');
			return;
		}
		$file_name = $this->get_file_name_param();
		if ($this->is_valid_file_object($file_name)) {
			$file_path = $this->get_upload_path($file_name, $this->get_version_param());
			if (is_file($file_path)) {
				if (!preg_match($this->options['inline_file_types'], $file_name)) {
					$this->header('Content-Description: File Transfer');
					$this->header('Content-Type: application/octet-stream');
					$this->header('Content-Disposition: attachment; filename="'.$file_name.'"');
					$this->header('Content-Transfer-Encoding: binary');
				} else {
					// Prevent Internet Explorer from MIME-sniffing the content-type:
					$this->header('X-Content-Type-Options: nosniff');
					$this->header('Content-Type: '.$this->get_file_type($file_path));
					$this->header('Content-Disposition: inline; filename="'.$file_name.'"');
				}
				$this->header('Content-Length: '.$this->get_file_size($file_path));
				$this->header('Last-Modified: '.gmdate('D, d M Y H:i:s T', filemtime($file_path)));
				$this->readfile($file_path);
			}
		}
	}

	protected function send_content_type_header() {
		$this->header('Vary: Accept');
		if (strpos($this->get_server_var('HTTP_ACCEPT'), 'application/json') !== false) {
			$this->header('Content-type: application/json');
		} else {
			$this->header('Content-type: text/plain');
		}
	}

	protected function send_access_control_headers() {
		$this->header('Access-Control-Allow-Origin: '.$this->options['access_control_allow_origin']);
		$this->header('Access-Control-Allow-Credentials: '
				.($this->options['access_control_allow_credentials'] ? 'true' : 'false'));
		$this->header('Access-Control-Allow-Methods: '
				.implode(', ', $this->options['access_control_allow_methods']));
		$this->header('Access-Control-Allow-Headers: '
				.implode(', ', $this->options['access_control_allow_headers']));
	}

	public function head() {
		$this->header('Pragma: no-cache');
		$this->header('Cache-Control: no-store, no-cache, must-revalidate');
		$this->header('Content-Disposition: inline; filename="files.json"');
		// Prevent Internet Explorer from MIME-sniffing the content-type:
		$this->header('X-Content-Type-Options: nosniff');
		if ($this->options['access_control_allow_origin']) {
			$this->send_access_control_headers();
		}
		$this->send_content_type_header();
	}

	public function get($print_response = true) {
		exit;
		if ($print_response && isset($_GET['download'])) {
			return $this->download();
		}
		$file_name = $this->get_file_name_param();
		if ($file_name) {
			$response = array(
					substr($this->options['param_name'], 0, -1) => $this->get_file_object($file_name)
			);
		} else {
			$response = array(
					$this->options['param_name'] => $this->get_file_objects()
			);
		}
		return $this->generate_response($response, $print_response);
	}

	public function post($print_response = true) {
		if (isset($_REQUEST['_method']) && $_REQUEST['_method'] === 'DELETE') {
			return $this->delete($print_response);
		}
		$upload = isset($_FILES[$this->options['param_name']]) ?
		$_FILES[$this->options['param_name']] : null;
		// Parse the Content-Disposition header, if available:
		$file_name = $this->get_server_var('HTTP_CONTENT_DISPOSITION') ?
		rawurldecode(preg_replace(
				'/(^[^"]+")|("$)/',
				'',
				$this->get_server_var('HTTP_CONTENT_DISPOSITION')
		)) : null;
		// Parse the Content-Range header, which has the following form:
		// Content-Range: bytes 0-524287/2000000
		$content_range = $this->get_server_var('HTTP_CONTENT_RANGE') ?
		preg_split('/[^0-9]+/', $this->get_server_var('HTTP_CONTENT_RANGE')) : null;
		$size =  $content_range ? $content_range[3] : null;
		$files = array();
		if ($upload && is_array($upload['tmp_name'])) {
			// param_name is an array identifier like "files[]",
			// $_FILES is a multi-dimensional array:
			foreach ($upload['tmp_name'] as $index => $value) {
				$files[] = $this->handle_file_upload(
						$upload['tmp_name'][$index],
						$file_name ? $file_name : $upload['name'][$index],
						$size ? $size : $upload['size'][$index],
						$upload['type'][$index],
						$upload['error'][$index],
						$index,
						$content_range
				);
			}
		} else {
			// param_name is a single object identifier like "file",
			// $_FILES is a one-dimensional array:
			$files[] = $this->handle_file_upload(
					isset($upload['tmp_name']) ? $upload['tmp_name'] : null,
					$file_name ? $file_name : (isset($upload['name']) ?
							$upload['name'] : null),
					$size ? $size : (isset($upload['size']) ?
							$upload['size'] : $this->get_server_var('CONTENT_LENGTH')),
					isset($upload['type']) ?
					$upload['type'] : $this->get_server_var('CONTENT_TYPE'),
					isset($upload['error']) ? $upload['error'] : null,
					null,
					$content_range
			);
		}
		return $this->generate_response(
				array($this->options['param_name'] => $files),
				$print_response
		);
	}

	public function delete($print_response = true) {
		$file_name = $this->get_file_name_param();
		$file_path = $this->get_upload_path($file_name);
		$success = is_file($file_path) && $file_name[0] !== '.' && unlink($file_path);
		if ($success) {
			foreach($this->options['image_versions'] as $version => $options) {
				if (!empty($version)) {
					$file = $this->get_upload_path($file_name, $version);
					if (is_file($file)) {
						unlink($file);
					}
				}
			}
		}
		return $this->generate_response(array('success' => $success), $print_response);
	}

}
